Question: I have a regency insert, which has the secondary burn tubes which support the top baffle. during operation the tubes started to glow red. the baffling and the rest of the stove did not. Is the glowing red of the sec air tubes considered an over fire or is this possibly normal? Answer: I've used a similar stove (avalon) and had the tubes glow regularly. Since metal can glow at temps of around 1000 degrees F, it can be difficult to avoid with a piece that is right in the path of the flame. These tubes are usually made of stainless steel and/or easily replaceable for just that reason.